EP0455886B1 - Affichage à cristaux liquides - Google Patents

Affichage à cristaux liquides Download PDF

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Publication number
EP0455886B1
EP0455886B1 EP90125355A EP90125355A EP0455886B1 EP 0455886 B1 EP0455886 B1 EP 0455886B1 EP 90125355 A EP90125355 A EP 90125355A EP 90125355 A EP90125355 A EP 90125355A EP 0455886 B1 EP0455886 B1 EP 0455886B1
Authority
EP
European Patent Office
Prior art keywords
liquid crystal
crystal display
fluorescent lamp
display according
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90125355A
Other languages
German (de)
English (en)
Other versions
EP0455886A2 (fr
EP0455886A3 (en
Inventor
Winfried Wieland
Mathias Bärenfänger
Djalal Motamedian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VDO Luftfahrtgerate Werk GmbH
Original Assignee
VDO Luftfahrtgerate Werk GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by VDO Luftfahrtgerate Werk GmbH filed Critical VDO Luftfahrtgerate Werk GmbH
Publication of EP0455886A2 publication Critical patent/EP0455886A2/fr
Publication of EP0455886A3 publication Critical patent/EP0455886A3/de
Application granted granted Critical
Publication of EP0455886B1 publication Critical patent/EP0455886B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/15—Thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/75—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with fins or blades having different shapes, thicknesses or spacing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133628—Illuminating devices with cooling means

Definitions

  • the invention relates to a liquid crystal display with a liquid crystal cell held by a housing, which is illuminated by a fluorescent tube arranged inside the housing.
  • liquid crystal displays which are usually referred to as flat displays, are used as instrumentation in air, sea and land vehicles and for plant and power plant monitoring and are known.
  • Difficulties with the known liquid crystal displays are the dissipation of the heat generated by the fluorescent tube, since the fluorescent tube is housed inside the housing.
  • the heat released by it passes through the air and the inner housing carrying the driver electronics through the electronic components and then again via an air gap to the outer housing, where it can be released to the outside air.
  • a liquid crystal display which has a diffusing screen on the back of its liquid crystal cell.
  • Fluorescent tubes for illuminating the liquid crystal display are provided behind the lens.
  • a cooling plate with cooling fins pointing away from the fluorescent tubes is also arranged at a distance from the fluorescent tubes.
  • the invention has for its object to design a liquid crystal display according to the preamble of claim 1 so that it can be cooled as well as possible without the risk of contamination of the liquid crystal cell.
  • the main heat is generated by a fluorescent tube in the lamp ends. It is therefore advantageous if, according to one embodiment of the invention, the front plate for the two lamp ends of the fluorescent tube has a sealed passage, through which a lamp end of the fluorescent tube projects into the cooling air flow toward the rear of the front plate. As a result, the lamp ends get more distance from the liquid crystal cell to be protected from heat and get directly into the cooling air flow, so that they can be cooled particularly intensively.
  • the lamp ends form an acute angle with the rest of the area of the fluorescent tube. As a result, the lamp ends are at a greater distance from the upper area of the housing, where a dead flow could form. Due to the acute-angled course, the lamp ends reach an area where high cooling air speeds can be reliably expected.
  • the liquid crystal display is particularly compact when the fan is arranged in the heat sink between the cooling fins.
  • the overall depth of the liquid crystal display becomes particularly small if, according to another development of the invention, several blowers are provided.
  • the fluorescent tube is fastened to a support plate, which in turn is fastened in a heat-conducting manner to the front plate of the heat sink.
  • the fluorescent tube can be designed together with the support plate as a structural unit which is easy to connect to the front plate.
  • the heat transfer from the fluorescent tube to the heat sink is particularly intense if the fluorescent tube is attached to the support plate or the front plate by a heat-conducting adhesive. In addition, such a connection is very inexpensive.
  • a fluorescent tube lying against a flat surface only has line contact with the surface, which makes heat conduction difficult. Instead of a line contact, a large-area surface contact can be achieved in a simple manner if, according to another advantageous embodiment of the invention, in the side of the support plate or the front plate facing the liquid crystal cell, a groove is provided, corresponding to the fluorescent tube, which receives the heat-conducting adhesive and into which the Fluorescent tube is partially embedded.
  • the liquid crystal display is generally particularly inexpensive to manufacture if the heat sink forms a central unit with the fluorescent tube and the blower or the blowers and possibly other components, which is inserted into an inner housing having the driver electronics on its four lateral surfaces.
  • An undesirable heat flow to the driver electronics can be reduced by providing the inside of the inner housing with thermal insulation.
  • liquid crystal displays are to be arranged directly next to one another and above one another, then it is necessary for the cooling air to be supplied and removed at the rear of the liquid crystal display. This is particularly easily possible if the heat sink is completely housed in the inner housing and if the back of the outer housing and thus also the inner one Housing and the central unit is covered by a rear wall having at least one air inlet and air outlet.
  • the liquid crystal display can also be designed in accordance with another embodiment of the invention in such a way that the cooling body protrudes rearward from the inner housing and that the air inlet and the air outlet are at the bottom or are provided at the top in the inner housing and outer housing.
  • the heat transfer from the fluorescent tube to the liquid crystal cell can be further reduced in the same way as in a thermos flask, if the space between the back of the liquid crystal cell and the front of the front plate, in which the fluorescent tube is arranged, forms a vacuum space.
  • FIG. 1 shows an outer housing 1, into which an inner housing 2 is inserted and fastened from the rear.
  • the inner housing 2 holds a liquid crystal cell 3 with its front side. It carries the driver electronics 6, 7 for the liquid crystal cell 3 on its four outer surfaces, of which two outer surfaces 4, 5 can be seen in FIG. 1.
  • a central unit 8 which is inserted from the rear into the inner housing 2 and has a heat sink 9 made of metal, which has a front plate 10 on which, with the interposition of a metallic support plate 11 on the side of the liquid crystal cell 3 Fluorescent tube 12 is attached.
  • This fluorescent tube 12 projects with its lamp ends 13 through a passage 14 in the support plate 11 and the front plate 10 into the heat sink 9, the lamp ends 13 being at an acute angle to the rest of the fluorescent tube area.
  • the front plate 10 can be designed so that a space 16 is created between the liquid crystal cell 3 and the front plate 10, which can be partially evacuated.
  • a fan 17 is shown inside the heat sink 9, which sucks in cooling air through an air inlet 18 of a rear wall 19, conveys it through the heat sink 9 and blows it outwards via an air outlet 20 on the upper side of the rear wall 19.
  • the lamp ends 13 are cooled directly by the cooling air flow.
  • the remaining heat of the fluorescent tube passes through the support plate 11 and the front plate 10 to the rear of the heat sink 9, where it is absorbed by the cooling air without cooling air being able to reach the liquid crystal cell 3.
  • a heat flow to the driver electronics 6, 7 can additionally be reduced by internal heat insulation 26 of the inner housing 2. To enable the air flow described, the flexible parts of the upper and lower driver boards must be folded so that they emerge from the side of the inner housing.
  • FIG. 2 shows that the heat sink 9 on the back of its front plate 10 has a large number of vertically extending cooling fins, for example the cooling fins 21, 22. It can also be seen that, in addition to the fan 17, a further, identical fan 23 is arranged in the heat sink 9. In the upper area one can see the lamp ends 13, 13a, which are each led into the heat sink 9 through a passage 15, 15a to be sealed. In practice, two meandering fluorescent tubes 12 will be used for a large-area liquid crystal display. FIG. 2 therefore shows that two passages 15b, 15c to be sealed can also be provided in the lower region of the heat sink 9, through which the ends 13b, 13c of a second fluorescent tube can protrude.
  • FIG. 3 shows the heat sink 9 with its front plate 10, the cooling fins 21, 22 and the blowers 23, 17. Furthermore, two fluorescent tubes 12, 12a can be seen, which are fastened on the support plate 11.
  • FIG. 4 shows a support plate 11 with passages 14, 14a to be sealed and a meandering fluorescent tube 12 attached to it.
  • the lamp end 13 extends at an acute angle to the fluorescent tube 12.
  • FIG. 6 illustrates the fastening of the fluorescent tube 12 on the support plate 11.
  • the support plate 11 has in its side facing the fluorescent tube 12 a meandering groove 24, corresponding to the fluorescent tube 12, into which a thermally conductive adhesive 25 is inserted.
  • the fluorescent tube 12 is embedded in this adhesive 25 so that it is connected to the support plate 11 with good thermal conductivity.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Geometry (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Claims (13)

  1. Afficheur à cristaux liquides comprenant une cellule de cristaux liquides (3) supportée par un boîtier et éclairée par transparence au moyen d'un tube fluorescent (12) installé à l'intérieur du boîtier, avec évacuation de la chaleur dégagée par le tube fluorescent (12) par le courant d'air d'un ventilateur (17, 23), caractérisé en ce que, derrière la cellule de cristaux liquides (3), le boîtier est divisé par la plaque frontale (10) d'un refroidisseur (9), de manière qu'entre la cellule de cristaux liquides (3) et la plaque frontale (10) soit formé un espace (16), dans lequel est installé le tube fluorescent (12), lequel est fixé sur le refroidisseur (9) par une liaison conduisant la chaleur, que la plaque frontale (10) comporte des nervures de refroidissement (21, 22) formées sur son côté éloigné de l'espace (16) et dirigées dans la zone arrière du boîtier, et qu'au moins un ventilateur (17, 23) est prévu pour produire un courant d'air à l'intérieur du boîtier (1, 2) le long des nervures de refroidissement (21, 22).
  2. Afficheur à cristaux liquides selon la revendication 1, caractérisé en ce que la plaque frontale (10) présente une traversée (15) étanchée pour chacun des deux bouts de lampe (13) du tube fluorescent (12), par laquelle un bout de lampe (13) du tube fluorescent (12) s'étend vers le côté arrière de la plaque frontale (10) dans le courant d'air de refroidissement.
  3. Afficheur à cristaux liquides selon la revendication 2, caractérisé en ce que les bouts de lampe (13) forment un angle aigu avec la partie restante du tube fluorescent (12).
  4. Afficheur à cristaux liquides selon au moins une des revendications précédentes, caractérisé en ce que le ventilateur (17, 23) est installé dans le refroidisseur (9) entre les nervures de refroidissement (21, 22).
  5. Afficheur à cristaux liquides selon au moins une des revendications précédentes, caractérisé en ce que plusieurs ventilateurs (17, 23) sont prévus.
  6. Afficheur à cristaux liquides selon au moins une des revendications précédentes, caractérisé en ce que le tube fluorescent (12) est fixé sur une plaque support (11), qui est elle-même fixée par une liaison conduisant la chaleur sur la plaque frontale (10) du refroidisseur (9).
  7. Afficheur à cristaux liquides selon au moins une des revendications précédentes, caractérisé en ce que le tube fluorescent (12) est fixé sur la plaque support (11) ou la plaque frontale (10) par un adhésif (25) conduisant la chaleur.
  8. Afficheur à cristaux liquides selon au moins une des revendications précédentes, caractérisé en ce que le côté, dirigé vers la cellule de cristaux liquides (3), de la plaque support (11) ou de la plaque frontale (10) présente une rainure (24) dont la configuration correspond à celle du tube fluorescent (12) et qui reçoit l'adhésif (25) conduisant la chaleur, dans lequel le tube fluorescent (12) est partiellement enfoncé.
  9. Afficheur à cristaux liquides selon au moins une des revendications précédentes, caractérisé en ce que le refroidisseur (9), le tube fluorescent (12) et le ventilateur (17) ou les ventilateurs (17, 23) et, éventuellement d'autres composants, constituent une unité centrale (8) glissée dans un boîtier intérieur (2) présentant l'électronique de commande (6, 7) sur ses quatre faces latérales extérieures (4, 5).
  10. Afficheur a cristaux liquides selon la revendication 9, caractérisé en ce que le boîtier intérieur (2) est pourvu intérieurement d'une isolation thermique (26).
  11. Afficheur à cristaux liquides selon la revendication 9 ou 10, caractérisé en ce que le refroidisseur (9) est logé complètement dans le boîtier intérieur (2) et que le côté arrière du boîtier extérieur (1) et par suite aussi du boîtier intérieur (2) et de l'unité centrale (8), est recouvert d'une paroi arrière (19) présentant au moins une admission d'air (18) et une sortie d'air (20).
  12. Afficheur à cristaux liquides selon au moins une des revendications précédentes, caractérisé en ce que le refroidisseur (19) dépasse vers l'extérieur du boîtier intérieur (2) et que l'admission d'air (18) et la sortie d'air (19) sont prévues respectivement en bas et en haut dans le boîtier intérieur (2) et le boîtier extérieur (1).
  13. Afficheur à cristaux liquides selon au moins une des revendications précédentes, caractérisé en ce que l'espace (16) entre le côté arrière de la cellule de cristaux liquides (3) et le côté avant de la plaque frontale (10), espace dans lequel est installé le tube fluorescent (12), forme un espace à dépression.
EP90125355A 1990-04-30 1990-12-22 Affichage à cristaux liquides Expired - Lifetime EP0455886B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4013846 1990-04-30
DE4013846A DE4013846A1 (de) 1990-04-30 1990-04-30 Fluessigkristallanzeige

Publications (3)

Publication Number Publication Date
EP0455886A2 EP0455886A2 (fr) 1991-11-13
EP0455886A3 EP0455886A3 (en) 1992-02-26
EP0455886B1 true EP0455886B1 (fr) 1994-08-03

Family

ID=6405435

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90125355A Expired - Lifetime EP0455886B1 (fr) 1990-04-30 1990-12-22 Affichage à cristaux liquides

Country Status (2)

Country Link
EP (1) EP0455886B1 (fr)
DE (2) DE4013846A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100353230C (zh) * 2005-01-18 2007-12-05 友达光电股份有限公司 背光组件

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DE9210692U1 (de) * 1992-08-11 1993-12-16 Opti Table Info-Systeme GmbH & Co KG, 42699 Solingen Flüssigkristall-Anzeigeeinrichtung
DE69323597T2 (de) * 1992-11-12 1999-08-19 Canon Kk Flüssigkristall-Anzeigevorrichtung
US5523110A (en) * 1994-06-23 1996-06-04 Nestec S.A Chocolate heat-resistance by particulate polyol gel addition
US5502582A (en) * 1994-09-02 1996-03-26 Aavid Laboratories, Inc. Light source cooler for LCD monitor
DE29513401U1 (de) * 1995-08-21 1996-12-19 Bachleitner, Wolfgang, 78655 Dunningen Anzeigesystem
DE19607817A1 (de) * 1996-03-01 1997-09-04 Mediatec Ges Fuer Multimediale Anzeigeeinrichtung, insbesondere zur Fahrgastinformation an Bahnsteigen
US5748269A (en) * 1996-11-21 1998-05-05 Westinghouse Air Brake Company Environmentally-sealed, convectively-cooled active matrix liquid crystal display (LCD)
JP2001265235A (ja) * 2000-03-15 2001-09-28 Nec Corp 光源装置及びそれを用いた液晶表示装置
FR2811777B1 (fr) 2000-07-11 2003-01-17 Thomson Csf Tete optique de visualisation a cristaux liquides
GB0411142D0 (en) * 2004-05-19 2004-06-23 Flasma Ltd Apparatus for showing moving images in a floor
WO2006119582A1 (fr) * 2005-05-13 2006-11-16 Tama Berkeljon Appareil d’eclairage
FR2891940B1 (fr) * 2005-10-06 2008-05-02 Cotep Sa Systeme d'affichage.
US7530702B2 (en) * 2006-05-12 2009-05-12 Visteon Global Technologies, Inc. Display over gage instrument cluster
DE102007012905A1 (de) * 2007-03-19 2008-09-25 Bayerische Motoren Werke Aktiengesellschaft Fahrzeug mit einem Head-Up-Display
DE102015016500B3 (de) * 2015-12-18 2017-03-23 Audi Ag Anordnung eines HUD-Moduls in einem Kraftfahrzeug und Verfahren zum Betreiben eines HUD-Moduls
CN110608424B (zh) * 2019-08-12 2020-10-20 温州麦麦文化传媒有限公司 舞台灯光散热装置

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JPS62250424A (ja) * 1986-04-23 1987-10-31 Matsushita Electric Ind Co Ltd 液晶表示装置
JPS635321A (ja) * 1986-06-25 1988-01-11 Mitsubishi Electric Corp 液晶表示器
US4748546A (en) * 1987-02-02 1988-05-31 Allied-Signal Inc. Fluorescent backlighting unit
DE3710628A1 (de) * 1987-03-31 1988-10-20 Demolux Overhead-projektor

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN100353230C (zh) * 2005-01-18 2007-12-05 友达光电股份有限公司 背光组件

Also Published As

Publication number Publication date
EP0455886A2 (fr) 1991-11-13
EP0455886A3 (en) 1992-02-26
DE59006708D1 (de) 1994-09-08
DE4013846A1 (de) 1991-10-31

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